With the launch of Apple’s iOS4, the App store has made lot of improvements. Many apps now come with the multi-tasking support and some apps have been optimized for the retina display of iPhone 4. Let’s have a quick look at the popular apps for iOS4.

#1. Twitter

Twitter for iPhone was updated on 22 Jun, and it brings support for iOS4 multitasking as well as the iPhone 4’s Retina Display.

Although we assume most apps will be updated to support the new features in iOS4 soon, with Twitter it’s doubly important, since many users (including us) yearned for the ability to have the app quietly await you in the background while you do other tasks.

Besides these new features, the new version of Twitter for iPhone brings a fix for the “stuck top tweets” bug and promises more secure tweeting and photo/video posting, meaning it’s now using Oauth for all communications with Twitter and hosting partners.

#2. GodFinger

GodFinger, ngmoco‘s latest and greatest buggy game, is iOS 4 ready! It’s not only just tested, but multitasking works.

#3. Tap Tap Revenge

Tap Tap Revenge 3 for iPhone has just updated to brings support for iOS 4 and the newly released iPhone 4. Tap Tap Revenge 3 brings Multitasking feature for the newly released iOS 4. Now you can continue the game from where you left, even after exiting to the home screen.